Filament for electric glow-lamps.



. 'Be it known that I, Hans tria-Hungary,

'iuent consisting of an alloy of antimony refractory metals and directly obtainable'by melting together their Y constituents and it being apparently are made from plastic masses consisting of la white heat in a neutral or reducing atmos-' phere. In order to manufacture filaments of alloys of the said-refractory metals and UNITED STATES PATENT o FIoE;

HANS KUZEL, OF BADEN, AUSTRIA-HUNGARY.

FILAMENT FOB ELECTRIC GLOW-LAMPS.

Application filed March 23,

To all whom it may concern 1{17)I1EL,-& subject of the Emperor of Germany, residing at t Baden, near Vienna, in the Empire of Ausg have invented certain new and'nseful Improvements in Filaments for Electric Glow-Lamps, of which the following is a full, clear, and exact description, I such as will enable others skilled in the art to make and use the same. I My invention relates to filaments for electric glow lamps and has for-its object a filametals melting at very .i such metals as chromimanganese, molybdenum, uranium, tungsten, vanadium, tantalum, niobium, titanium, thorimnfzirconinm, platinum, osmium or iridium.- .The alloys of the said antimony not being with one or more high temperatures,

1mp0s-. sible to make filaments of such alloys I shall first briefly set forth the method by which I propose to make filaments, although this method forms a subject of other applications filed by me, namely SerialNos. 239637 and 291909; According to this. method filamentscolloids of the refractory metals with or without the addition of such refractory metals in a finely powdered solid state and with then brought into the deshape by. any suitable process such as sqi mg, whereupon the th eads or bodies thus obtained are dried and finally heated to of antimony Iincorporate into the .plastic masses just described antimonyeither in a. colloidal or finely powdered solid state. Or

Specification of Letters Patent.

1906.- Serial No. 307,695.

into the said plastic mass sulfur or oxygen compounds of antimony either in a colloidal or finely powdered solid state. In all cases I thus obtain a plastic-mass containing besides the refractory elementsalsoantimony. This plastic mass is then in the manner Patented. Mareh2, 1909;

above referred to brought into the desired 4 form. then thebodies obtained are dried and finally heated to a white heat whereby the colloids are returned to their ordinary crystallinestate, the oxygen or sulfur compounds being reduced at the same time in the reducing atmosphere. In any case I obtain by such heating filaments consisting of an alloy of the above named refractory metals and antimony. The presence of antimony in the filaments has for its effect a notable increase of the electrical resistance of the filaments.

i The -oxygen o lsulfur compounds of antimony, if any are used, should not exceed twenty per cent. by weight of the dry mass. The proportion of antimony in the finished filament is usually five to ten per cent. by weight of the entire filament, but it may increase even to twenty per cent. by weight Without detriment.

I claim as my invention- K 1. A filament for 'anelectric glow lamp co taining an alloy of a refractory metal as he ein described with antimony.

2. A filanient for an electric consisting of an alloy of tungsten with ant-1- mon y I 4 3. A filament for an electrlc glow lamp containing an alloy" of tungsten with anti-' "Witnesses; .1

01m Gnonen Hannr,

instead of pure antimony I may incorporate Atvns'ro Sq Hosea in thepresence of glow lamp 7 

